Best practice for dynamic javascript?

PHP
1

I’m using the LightGallery plugin to build a gallery, however, I need to spit out some dynamic javascript with PHP that data about images in the gallery.

For example, the script below would initialize the gallery when a user clicks on an image.

const dynamicGallery = window.lightGallery($dynamicGallery, {
  dynamic: true,
  plugins: [lgZoom, lgVideo, lgThumbnail],
  dynamicEl: [
    {
      src:
        "https://images.unsplash.com/photo-1542103749-8ef59b94f47e?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1542103749-8ef59b94f47e?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1542103749-8ef59b94f47e?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1542103749-8ef59b94f47e?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@dann">Dan</a></h4>
                    <p>Published on November 13, 2018</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1473876988266-ca0860a443b8?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1473876988266-ca0860a443b8?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1473876988266-ca0860a443b8?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1473876988266-ca0860a443b8?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@kylepyt">Kyle Peyton</a></h4>
                    <p>Published on September 14, 2016</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1588953936179-d2a4734c5490?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1588953936179-d2a4734c5490?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1588953936179-d2a4734c5490?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1588953936179-d2a4734c5490?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@jxnsartstudio">Garrett Jackson</a></h4>
                    <p>Published on May 8, 2020</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1591634616938-1dfa7ee2e617?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1591634616938-1dfa7ee2e617?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1591634616938-1dfa7ee2e617?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1591634616938-1dfa7ee2e617?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@brookecagle">Brooke Cagle</a></h4>
                    <p>Description of the slide 4</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1609902726285-00668009f004?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1609902726285-00668009f004?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1609902726285-00668009f004?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1609902726285-00668009f004?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@bruno_adam">Bruno Adam</a></h4>
                    <p>Published on January 6, 2021</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1573007974656-b958089e9f7b?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1573007974656-b958089e9f7b?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1573007974656-b958089e9f7b?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1573007974656-b958089e9f7b?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@sigmund">Sigmund</a></h4>
                    <p>Published on November 6, 2019</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1579406842270-ea87c39a8a12?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1579406842270-ea87c39a8a12?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1579406842270-ea87c39a8a12?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1579406842270-ea87c39a8a12?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@chow_parij">Parij Borgohain</a></h4>
                    <p>Published on January 19, 2020</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1598911543663-37d77962beb1?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1598911543663-37d77962beb1?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1598911543663-37d77962beb1?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1598911543663-37d77962beb1?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@inespiazzese">Ines Piazzese</a></h4>
                    <p>Published on September 1, 2020</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1560885673-2cdc12600ec8?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1560885673-2cdc12600ec8?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1560885673-2cdc12600ec8?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1560885673-2cdc12600ec8?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@rdsaunders">Richard Saunders</a></h4>
                    <p>Published on June 19, 2019</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1571292064306-669f0e758231?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1571292064306-669f0e758231?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1571292064306-669f0e758231?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1571292064306-669f0e758231?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@jalanmeier">J. Meier</a></h4>
                    <p>Published on October 17, 2019</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1601935111741-ae98b2b230b0?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1601935111741-ae98b2b230b0?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1601935111741-ae98b2b230b0?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1601935111741-ae98b2b230b0?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                    <h4>Photo by <a href="https://unsplash.com/@brookecagle">Brooke Cagle</a></h4>
                    <p>Published on October 6, 2020</p>
                </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1609342122563-a43ac8917a3a?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1609342122563-a43ac8917a3a?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1609342122563-a43ac8917a3a?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1609342122563-a43ac8917a3a?ixlib=rb-1.2.1&ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&auto=format&fit=crop&w=240&q=80",
      subHtml: `<div class="lightGallery-captions">
                <h4>Photo by <a href="https://unsplash.com/@brookecagle">Brooke Cagle</a></h4>
                <p>Description of the slide 1</p>
            </div>`
    },
    {
      video: {
        source: [
          {
            src: "https://www.lightgalleryjs.com//videos/video1.mp4",
            type: "video/mp4"
          }
        ],
        attributes: { preload: false, controls: true }
      },
      thumb:
        "https://www.lightgalleryjs.com//images/demo/html5-video-poster.jpg",
      subHtml: `<div class="lightGallery-captions">
                <h4>Photo by <a href="https://unsplash.com/@brookecagle">Brooke Cagle</a></h4>
                <p>Description of the slide 2</p>
            </div>`
    },
    {
      src:
        "https://images.unsplash.com/photo-1477322524744-0eece9e79640?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1400&q=80",
      responsive:
        "https://images.unsplash.com/photo-1477322524744-0eece9e79640?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=480&q=80 480, https://images.unsplash.com/photo-1477322524744-0eece9e79640?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=800&q=80 800",
      thumb:
        "https://images.unsplash.com/photo-1477322524744-0eece9e79640?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=240&q=80"
    },
    {
      src: "//www.youtube.com/watch?v=egyIeygdS_E",
      poster: "https://img.youtube.com/vi/egyIeygdS_E/maxresdefault.jpg",
      thumb: "https://img.youtube.com/vi/egyIeygdS_E/maxresdefault.jpg"
    }
  ]
});
document.querySelectorAll(".gallery-items").forEach((el, index) => {
  el.addEventListener("click", () => {
    dynamicGallery.openGallery(index);
  });
});

I could just use echo and a foreach loop to plug in the data from the gallery array, but that kind of looks messy…

2

You could have the javascript fetch the array from the backend at runtime. It’d look cleaner in the code, at least.

3 
// Function called upon successful AJAX request to display the category gallery and bind click events
    const categoryUISuccess = (parsedData) => {
        createGallery(parsedData);
        bindEvents();
    };
    
    const categoryUIError = (error) => {
        console.log("Database Table did not load", error);
    }

    const createRequest = (url, succeed, fail) => {
        console.log('database_data', database_data);
        fetch(url, {
            method: 'POST', // or 'PUT'
            body: JSON.stringify(database_data)
        })
            .then((response) => handleErrors(response))
            .then((data) => succeed(data))
            .catch((error) => fail(error));
    };

 // Fetch the data for the current page and category
        createRequest('galleryImagesGet.php', categoryUISuccess, categoryUIError);

The above off is just a small snippet of JavaScript code, but using fetch is real easy and a lot less mess like already stated.

Here’s part of the script that might interest you → 

    const createGalleryItem = (slide) => {
        // Create the main gallery item element and add the gallery-item class
        const galleryItem = document.createElement('div');
        galleryItem.classList.add('gallery-item');

        // Create the images element and add the images class
        const images = document.createElement('div');
        images.classList.add('images');

        const galleryImage = document.createElement('img');
        galleryImage.src = window.innerWidth < 500 ? slide.image_path : slide.thumb_path;
        galleryImage.dataset.image = slide.image_path;
        galleryImage.alt = slide.content;
        galleryImage.dataset.exif = `${slide.Model} ${slide.ExposureTime} ${slide.Aperture} ${slide.ISO} ${slide.FocalLength}`;


        // Create the hidden paragraph element and set its text content
        const paragraph = document.createElement('p');
        paragraph.classList.add('hideContent');
        paragraph.textContent = slide.content;

        // Add the gallery image and hidden paragraph elements to the images element
        images.appendChild(galleryImage);
        images.appendChild(paragraph);

        // Create the title element and add the title class
        const title = document.createElement('div');
        title.classList.add('title');

        // Create the heading 1 element and set its text content
        const heading1 = document.createElement('h1');
        heading1.classList.add('pictureHeading');
        heading1.textContent = `${slide.heading[0].toUpperCase()}${slide.heading.slice(1)}`;

        // Create the title span element and set its text content
        const titleSpan = document.createElement('span');
        titleSpan.classList.add('exifInfo');
        titleSpan.textContent = slide.Model;

        // Add the heading 1 and title span elements to the title element
        title.appendChild(heading1);
        title.appendChild(titleSpan);

        // Add the images and title elements to the gallery item element
        galleryItem.appendChild(images);
        galleryItem.appendChild(title);

        // Return the completed gallery item element
        return galleryItem;
    };

And here a link to a live page that is using the whole script → https://www.fanoflego.com/gallery.php

4

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